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Finding the Fourth Proportional to 201.87, 278.60 and 139.77

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Solution

The fourth proportional to 201.87, 278.60 and 139.77 is: 192.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.87 : 278.60 = 139.77 : x
  2. Step 2: Convert to fraction form
    201.87/278.60 = 139.77/x
  3. Step 3: Cross multiply
    201.87x = 278.60 × 139.77
  4. Step 4: Simplify right side
    201.87x = 38,939.22
  5. Step 5: Solve for x
    x = 38,939.22/201.87
  6. Step 6: Final answer
    x = 192.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.